In order to add color to your gel wax, liquid candle dyes are highly recommended. This is due to the way that gel wax thins as opposed to liquefy like other waxes. Using a powder or block candle dye will result in clumping and uneven coloring. These forms can be used to dye gel wax, but it is way easier just to use the liquid dyes from the start.
Gel Wax Wicks–

Choosing the right wick for gel wax is key. The general rule of thumb is to wick up with gel wax.

The process to select the correct wick size is to measure the diameter of your container. You do this by taking a ruler and measuring across the center of the opening of the container. Once you have this information, check the wick suggestions chart. However, remember that you must wick up. This means if your container is 3 inches in diameter, you will look at the wick suggestions for a 4 inch candle. This is wicking up (which is basically adding an inch to your diameter).

Gel Containers–

There are three important factors to consider when choosing your gel wax container.

First, the container must be crack resistant.

Secondly, the container must be able to stand high heat from the burning candle. Remember, gel wax burns at a higher temperature than other waxes. Coupled with the open flame and the high temperature of the melt pool, you want to make sure the container can with stand the heat.

Lastly, the container you select cannot leak. As with all candles that you craft, you do not want to have liquid wax spilling out onto any surfaces.